Design of a Highly Crystalline Low-Band Gap Fused-Ring Electron Acceptor for High-Efficiency Solar Cells with Low Energy Loss,Chemistry of Materials

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Design of a Highly Crystalline Low-Band Gap Fused-Ring Electron Acceptor for High-Efficiency Solar Cells with Low Energy Loss
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-09-22 00:00:00 , DOI: 10.1021/acs.chemmater.7b02853
Xueliang Shi ₁ , Lijian Zuo ₁ , Sae Byeok Jo ₁ , Ke Gao ₁ , Francis Lin ₂ , Feng Liu ₃ , Alex K.-Y. Jen _{1,

2,

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Affiliation

A fused-ring thiophene-thieno[3,2-b]thiophene-thiophene (4T)-based low-band gap electron acceptor, 4TIC, has been designed and synthesized for non-fullerene solar cells. The utilization of the 4T center core enhances the charge mobility of 4TIC and extends its absorption band edge to ∼900 nm, which facilitates its function as a very efficient low-band gap electron acceptor. The rigid, π-conjugated framework of 4T also offers a lower reorganization energy to facilitate lower V_OC energy loss. Femtosecond transient spectroscopy showed a level of polaron generation in 4TIC results in the more efficient transfer of energetic carriers higher than that seen with the benchmarked molecule, ITIC. Film morphology analysis has also shown that 4TIC has structural order that is more prominent than that of ITIC with a multiscale phase separation in the blend with donor polymer PTB7-Th. As a result, solar cells based on PTB7-Th and 4TIC exhibit a high power conversion efficiency of 10.43% and a relatively low non-ideal photon energy loss of 0.33 V. The low band gap and small energy loss make 4TIC suitable for tandem solar cells as a back-cell to reduce the transmission loss. As a demonstration, we fabricated series connection tandem solar cells incorporating 4TIC, which exhibts a high device performance of 12.62%.

中文翻译：

用于低能量损失的高效太阳能电池的高结晶低带隙熔融环电子受体的设计

设计并合成了用于非富勒烯太阳能电池的稠环噻吩-噻吩并[3,2- b ]噻吩-噻吩（4T）基低带隙电子受体4TIC。4T中心核的利用增强了4TIC的电荷迁移率，并将其吸收带边缘扩展至约900 nm，这有利于其充当非常有效的低带隙电子受体。4T的刚性π共轭框架还提供了较低的重组能量，以促进较低的V _OC能量损失。飞秒瞬态光谱显示4TIC中的极化子产生水平导致能量载体的更有效转移比基准分子ITIC更高。膜形态分析还显示，在与供体聚合物PTB7-Th的共混物中进行多尺度相分离时，4TIC具有比ITIC更突出的结构顺序。结果，基于PTB7-Th和4TIC的太阳能电池表现出10.43％的高功率转换效率和0.33 V的相对较低的非理想光子能量损耗。低带隙和小的能量损耗使4TIC适用于串联太阳能电池作为背电池，以减少传输损耗。作为演示，我们制造了包含4TIC的串联串联太阳能电池，该器件具有12.62％的高器件性能。

更新日期：2017-09-23

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